Re: [Asrg] What are the IPs that sends mail for a domain?

Seth <sethb@panix.com> Wed, 17 June 2009 13:24 UTC

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From: Seth <sethb@panix.com>
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In-reply-to: <Pine.GSO.4.64.0906161906450.27272@nber6.nber.org> (message from Daniel Feenberg on Tue, 16 Jun 2009 19:17:41 -0400 (EDT))
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Date: Wed, 17 Jun 2009 09:24:18 -0400 (EDT)
Subject: Re: [Asrg] What are the IPs that sends mail for a domain?
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Daniel Feenberg <feenberg@nber.org> wrote:

> I predict that no significant amount of mail ever originates from
> IPV6. Because it would be impossible to maintain a DNSBL for IPV6,

But a DNSWL would be just as easy as IPV4.  So all it would take is
half a dozen of the largest senders and receivers (google, microsoft,
outblaze, aol, etc.) to use IPV6 among themselves and your statement
would already be wrong.

Then, if they set up a method to allow others to tentatively whitelist
IPV6 addresses, they could switch to more draconian blocking/checking
of IPV4 space over time.

Seth